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Hydrocarbon saturation evaluation method based on rock electrical structure coefficient

A technology of rock electric structure coefficient and evaluation method, applied in the direction of suspension and porous material analysis, measuring devices, scientific instruments, etc., can solve the problems of poor operability and practicability, and achieve easy computer programming and calculation, good theoretical basis and Experimental basis, wide adaptability effect

Active Publication Date: 2014-12-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0015] The purpose of the present invention is to solve the problem of poor operability and practicability of the method for evaluating the oil-gas saturation of fractured-vug reservoirs in the prior art, and to provide a method for evaluating oil-gas saturation based on the rock-electrical structure coefficient , improve the accuracy of saturation evaluation and have strong operability

Method used

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  • Hydrocarbon saturation evaluation method based on rock electrical structure coefficient
  • Hydrocarbon saturation evaluation method based on rock electrical structure coefficient
  • Hydrocarbon saturation evaluation method based on rock electrical structure coefficient

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Embodiment 1

[0092] Using the logging data of volcanic rock reservoirs from several wells in the Songliao Basin, the present invention is used to calculate the gas saturation, and the calculation result is compared with the gas saturation determined by the core mercury injection data, and the two are very close , the absolute error is within 5% (as shown in Table 1), indicating that the method of the present invention has a good application effect in volcanic rock reservoirs.

[0093]

[0094]

[0095] Table 1

Embodiment 2

[0097] The Puguang Gas Field is a fractured-vuggy carbonate reservoir with systematic core saturation analysis data. According to the logging data, this method is used to calculate the gas saturation, and the calculation results are compared with the core analysis results (as shown in Table 2 and Figure 4 shown), the absolute error of saturation is within 4%, which proves the correctness of this method and its effectiveness in carbonate reservoir areas.

[0098]

[0099] Table 2

[0100] The method of the present invention aims at the inadaptability of the traditional Archie formula to complex fracture-cavity reservoirs, and proposes a new method for evaluating saturation, which has broad application prospects in the oil and gas exploration and development of increasingly rising volcanic rocks, carbonate rocks and other reservoirs .

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Abstract

The invention provides a hydrocarbon saturation evaluation method based on a rock electrical structure coefficient, and belongs to the hydrocarbon saturation evaluation field. The method comprises the following steps: (1) determining the rock electrical structure coefficient tau; (2) determining a coupling equation of the rock electrical structure coefficient tau and an m index; and (3) determining the hydrocarbon saturation. By using the method, the calculation accuracy of the hydrocarbon saturation of a fractured-vuggy reservoir is greatly improved; and the method has good maneuverability and practicability, and changes a situation that a result is calculated according to experience or complex numerical simulation at present when an Archie theory is corrected.

Description

technical field [0001] The invention belongs to the field of evaluation of oil-gas saturation, and in particular relates to an evaluation method of oil-gas saturation based on rock electric structure coefficient. Background technique [0002] Since Mr. Archie published Archie's formula in 1942, it has become the theoretical basis for oil and gas saturation logging evaluation and has been widely used in practice. It is still the mainstream method for oil and gas saturation evaluation. The traditional Archie's formula is suitable for clean sandstone reservoirs dominated by intergranular pores and relatively large porosity (>15%). Archie's formula has four key parameters (collectively referred to as regional parameters), which are m index (also called cementation index, with a theoretical value of 2), n index (also called saturation index, with a theoretical value of 2), a coefficient (theoretical value of 1) and b coefficient (theoretical value of 1). These regional coeff...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 李军张军王晓畅胡瑶刘志远路菁于文芹
Owner CHINA PETROLEUM & CHEM CORP
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